Preparation Steps

• In a large skillet, heat olive oil over medium-high heat. Add sirloin steak and cook until browned, about 3-5 minutes. Remove steak from skillet and set aside.
• Add sliced onion and bell pepper to the same skillet. Cook until softened, about 5-7 minutes.
• Return the steak to the skillet. Stir in salt and pepper.
• Sprinkle both cheddar and provolone cheeses over the steak and vegetable mixture. Cook until the cheese is melted and bubbly.
• While the cheese is melting, slice the slider buns in half horizontally. Brush the cut sides with melted butter.
• Toast the slider buns under the broiler or in a toaster oven until golden brown.
• Spoon the cheesesteak mixture onto the bottom halves of the toasted slider buns.
• Place the top halves of the buns on top. Serve immediately.